首页
登录
职称英语
[originaltext] I am in search of another planet in the universe where life e
[originaltext] I am in search of another planet in the universe where life e
游客
2024-04-07
47
管理
问题
I am in search of another planet in the universe where life exists. [23-1] I can’t see this planet with my naked eyes or even with the most powerful telescopes we currently possess. But I know that it’s there. And understanding contradictions that occur in nature will help us find it.
On our planet, where there’s water, there’s life. So we look for planets that orbit at just the right distance from their stars. At this distance, shown in blue on this diagram for stars of different temperatures, planets could be warm enough for water to flow on their surfaces as lakes and oceans where life might reside. [23 - 2] Some astronomers focus their time and energy on finding planets at these distances from their stars. What I do picks up where their job ends. I model the possible climates of exoplanets. And here’s why that’s important: there are many factors besides distance from its star that control whether a planet can support life.
Take the planet Venus. It’s named after the Roman goddess of love and beauty, because of its benign, ethereal appearance in the sky. But spacecraft measurements revealed a different story. The surface temperature is close to 900 degrees Fahrenheit, 500 Celsius. That’s hot enough to melt lead. Its thick atmosphere, not its distance from the sun, is the reason. It causes a greenhouse effect on steroids, trapping heat from the sun and scorching the planet’s surface. The reality totally contradicted initial perceptions of this planet. [24] From these lessons from our own solar system, we’ve learned that a planet’s atmosphere is crucial to its climate and potential to host life.
We don’t know what the atmospheres of these planets are like because the planets are so small and dim compared to their stars and so far away from us. For example, one of the closest planets that could support surface water—it’s called Gliese 667 Cc—such a glamorous name, right, nice phone number for a name—it’s 23 light years away. So that’s more than 100 trillion miles. Trying to measure the atmospheric composition of an exoplanet passing in front of its host star is hard. It’s like trying to see a fruit fly passing in front of a car’s headlight. OK, now imagine that car is 100 trillion miles away, and you want to know the precise color of that fly.
So I use computer models to calculate the kind of atmosphere a planet would need to have a suitable climate for water and life.
Here’s an artist’s concept of [25] the planet Kepler-62f, with the Earth for reference. It’s 1,200 light years away, and just 40 percent larger than Earth. Our NSF-funded work found that it could be warm enough for open water from many types of atmospheres and orientations of its orbit. So I’d like future telescopes to follow up on this planet to look for signs of life.
23. Different from other astronomers, what does the speaker do?
24. What is crucial to a planet’s climate and potential to host life?
25. How far away is the planet Kepler-62f from earth?
选项
A、It’s 23 light years away.
B、It’s more than 100 trillion miles away.
C、It’s 1,200 light years away.
D、It’s 100 trillion miles away.
答案
C
解析
演讲中提到,“Gliese 667 Cc”,“23光年”,“100万亿英里”,而Kepler-62f距离地球则是1200光年。故选C。这种考查数字的细节问题,应该特别注意听每一个数字和相关的事件,做好笔记。
转载请注明原文地址:http://tihaiku.com/zcyy/3544808.html
相关试题推荐
[originaltext]Inrecentyears,manyAmericansofbothsexesandvariousage
[originaltext]Inrecentyears,manyAmericansofbothsexesandvariousage
[originaltext]Weknowthatwehavetopayforwhatweget.Ifwebuyfood,
[originaltext]M:Excuseme,couldyoupleasetellmehowtogettothetennisc
[originaltext]M:Excuseme,couldyoupleasetellmehowtogettothetennisc
[originaltext]M:Goodmorning,class.W:Goodmorning,sir.M:Todaywe’lldisc
[originaltext]M:Goodmorning,class.W:Goodmorning,sir.M:Todaywe’lldisc
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
随机试题
Sender:JohnNicholsDate:March1,2010,10:04a.m.Receiver:ParentsofJunio
【说明】假设你是南京第一中学的英语老师,为你的学生LindaChen写一封留学推荐信。【内容】1.认识LindaChen已经3年;2.极力
【S1】[br]【S6】ranked→ranking非谓语动词误用。此处考查考生对分词的掌握,主句的谓语是find,从句是宾语从句,从句的谓语是hasfa
[originaltext]M:It’salwayssohotandhumidinhere.W:That’sbecausethere
[originaltext]Hello,everyone.Iwanttosharesomethingaboutmyselfwith
下列各项,不属药物抗早孕禁忌证的是()A.高危人流对象 B.高血压
抗人球蛋白试验的关键环节是()A.温度 B.时间 C.洗涤 D.离心 E
长春新碱治疗ALL时的主要不良反应有A.肝功能损害 B.肾功能损害 C.末梢
公安机关是对违法犯罪行为施加影响最普遍、最直接、最及时的力量。( )
锚具、夹具及连接器进场验收时,应按出厂合格证和质量证明书核查其锚固性能类别、型号
最新回复
(
0
)